diff --git a/xrpl/models/requests/subscribe.py b/xrpl/models/requests/subscribe.py
index b05a2d561..278f1d686 100644
--- a/xrpl/models/requests/subscribe.py
+++ b/xrpl/models/requests/subscribe.py
@@ -21,6 +21,7 @@
 class StreamParameter(str, Enum):
     """Represents possible values of the streams query param for subscribe."""
 
+    BOOK_CHANGES = "book_changes"
     CONSENSUS = "consensus"
     LEDGER = "ledger"
     MANIFESTS = "manifests"